Проверь, решив уравнения.

Пошаговое решение:

1. 1) x + 25 = 40
   x = 40 - 25
   x = 15
   
   x + 25 = 60
   x = 60 - 25
   x = 35
2. 2) x * 3 = 84
   x = 84 : 3
   x = 28
   
   x * 3 = 72
   x = 72 : 3
   x = 24
3. 3) x - 28 = 50
   x = 50 + 28
   x = 78
   
   x - 28 = 49
   x = 49 + 28
   x = 77
4. 4) 90 - x = 42
   x = 90 - 42
   x = 48
   
   90 - x = 52
   x = 90 - 52
   x = 38
5. 5) x : 5 = 9
   x = 9 * 5
   x = 45
   
   x : 5 = 11
   x = 11 * 5
   x = 55
6. 6) 96 : x = 6
   x = 96 : 6
   x = 16
   
   96 : x = 4
   x = 96 : 4
   x = 24